EP1287585A1 - Carrier element for an antenna with low hand sensitivity - Google Patents
Carrier element for an antenna with low hand sensitivityInfo
- Publication number
- EP1287585A1 EP1287585A1 EP01903627A EP01903627A EP1287585A1 EP 1287585 A1 EP1287585 A1 EP 1287585A1 EP 01903627 A EP01903627 A EP 01903627A EP 01903627 A EP01903627 A EP 01903627A EP 1287585 A1 EP1287585 A1 EP 1287585A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shield
- carrier element
- antenna
- point
- turn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/04—Screened antennas
Definitions
- the present invention relates to a support element for an antenna according to the preamble of patent claim 1.
- portable receivers For the registration of people or objects, portable receivers are used, which are usually designed as so-called smart cards or chip cards, e.g. from U.S. 5,844,244 are known. Such cards are often referred to as electronic tickets.
- WO 98/26370 describes a wireless communication system with portable receivers, in which the data transmission takes place via the (magnetic) H field.
- Frequencies of 6.78 MHz, 13.5 MHz or 2 7 MHz are typically provided.
- transmitters of the abovementioned frequency are arranged in the entrance area of a door of a public transport, the emitted electromagnetic field is designed as a near field in the aforementioned entrance area.
- the term near field means that the so-called H-field component dominates.
- the area of the near field is usually defined with a distance r, for which the relationship r ⁇ 0.6 * ⁇ applies, ⁇ stands for the wavelength.
- ⁇ 22 m, so that the near field conditions are met up to a distance of approximately 12 m.
- the transmission by means of frequencies of the aforementioned examples would require large antennas with dimensions of several meters.
- the maximum size of the antenna is determined by the dimensions of a device or a carrier element.
- the receiving antenna must be reduced to the dimensions of a chip card, for example.
- chip cards usually have dimensions of credit cards, namely 53 x 85mm 2 .
- Such a strong reduction in antenna size leads on the one hand to very low antenna reception voltages and on the other hand to an increased sensitivity of the antenna voltage to environmental influences.
- the low sensitivity can usually be compensated for using a suitable amplifier pre-stage.
- the energy consumption of such preliminary stages must be as small as possible.
- the antenna voltage in the near field is inversely proportional to the third power of the distance between the receiving antenna and the transmitting antenna. For reasons of space, the number of turns of such antennas is limited.
- the present invention is therefore based on the object of specifying a carrier element for an antenna which is insensitive to disturbing influences from the surroundings.
- the shielding impresses with its simple feasibility, in which only somewhat wider conductor tracks are to be provided on the supporting circuit board at the edge (claim 5).
- a further improvement of the shielding effect results with shields arranged in additional levels (claim 6).
- the segmentation of the further shields further reduces the sensitivity to interference.
- the segments can be insulated - called “floating" in technical terminology - or partially electrically connected to the ground (technical terminology: ground) (claim 8).
- FIG la supervision of a chip card as the inventive carrier element of the antenna Figure lb sectional view of the support element according to the invention with optional additional shields / Figure 2 view of the structure of additional shields.
- FIG. 1a shows a chip card in the view as the carrier element 5.
- the carrier element 5 is designed in multiple layers.
- the rectangle 3 gives the approximate extent of the layer mass
- a loop antenna 11 - hereinafter only called antenna - is arranged with seven turns along the U fanges of the support element 5, the contact is made via the connections 12.
- the other connections on the multi-layer support element 5 are omitted and only two of the seven Turns shown.
- Figure la shields 21 are shown hatched, which surround the turns of the antenna 11 above and below. In real supervision, however, the turns of the antenna 11 would be invisible.
- the number of turns of the antenna 11 is determined by the geometry of the carrier element 5 and by the design of the preamplifier stage required for amplifying the antenna voltage.
- the antenna 11 is arranged in one plane.
- electrical shields 21 are provided above and below the antenna windings.
- the shield 21 or 2l x and 2I 2 each connected to a reference point 3, see FIG. 1b, is attached, which has the direct influence of the environment, ie a capacitive coupling to the winding prevented.
- Such coupling acts as an antenna extension and this can result in a higher antenna voltage. Because of the detuning of the antenna 11 associated with this, this effect is undesirable and is achieved with the shield 21 or 21; * . and 21 fixed.
- the coupling takes place by attaching the shield 21 or 21 ⁇ and 21 2 only through the magnetic component, namely with the H field, cf.
- Vector representation H in Figure la The mass (ground layer) is usually chosen as the reference point 3.
- the antenna 11 is tuned resonance to the reception requirement, this tuning can be carried out with a capacitor connected in parallel (not shown in the figures). If a larger bandwidth is required, the antenna can also be coupled in aperiodically.
- the distance between the shields 21 1 and 21 2 is approximately 0.6 to 1 mm. Depending on the application, the distance can also be greater than 1 mm.
- the shields 21 and 21 2 must be separated at a point 22 in order to prevent a circulating current, which would otherwise dampen the magnetic field to an unacceptably high degree.
- the separation 22 in FIG. 1 a is arranged opposite the connections 12 of the antenna 11.
- Epoxy resin FR4 can be used for the carrier material.
- the additional layers required for a chip card such as mass (ground layer), L1, L2, etc. with the conductor tracks for the electronic components are not shown in FIG. 1b.
- FIG. 2 shows a special embodiment of the arrangement and separation of the additional shield 61.
- Such shields should be made as symmetrical as possible, for example by means of segments 61 r and 61 ⁇ ⁇ . With a division into four quadrants, it may be appropriate, depending on the application, to connect point-symmetrically or mirror-symmetrically two of the four segments with the layer ground (ground layer) ,
- All shields 21 and 61 consist of thin copper foil or are designed as conductor tracks, the width of which is greater than the width of the antenna windings.
- the antenna windings are also designed as conductor tracks.
- the antenna voltage only changes by a few percent when approached by hand.
- the antenna factor which as
- Vm typically 10 -.
- the following antenna voltage can thus be expected for the frequency 6.78 MHz at 1 W transmission power at a distance of approximately 1.5 with a carrier element 5 with seven antenna windings: 1 mV. At a greater distance of approx. 4 m, the antenna voltage would reduce to approx. 50 ⁇ V.
- hand sensitivity can be further reduced by applying additional shielding layers.
- the design of the carrier element according to the invention is not limited to frame-shaped antennas. Depending on the field of application of the antenna, topologically equivalent shapes are also possible; in particular, the present invention can also be implemented for ring antennas.
- the shield 21 may also be sufficient to attach the shield 21 only on one side.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Details Of Aerials (AREA)
- Gyroscopes (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01903627A EP1287585B1 (en) | 2000-05-15 | 2001-01-08 | Carrier element for an antenna with low hand sensitivity |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00110358 | 2000-05-15 | ||
EP00110358A EP1158601A1 (en) | 2000-05-15 | 2000-05-15 | Support device with an antenna with low sensitivity |
EP01903627A EP1287585B1 (en) | 2000-05-15 | 2001-01-08 | Carrier element for an antenna with low hand sensitivity |
PCT/EP2001/000097 WO2001089034A1 (en) | 2000-05-15 | 2001-01-08 | Carrier element for an antenna with low hand sensitivity |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1287585A1 true EP1287585A1 (en) | 2003-03-05 |
EP1287585B1 EP1287585B1 (en) | 2003-12-03 |
Family
ID=8168723
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00110358A Withdrawn EP1158601A1 (en) | 2000-05-15 | 2000-05-15 | Support device with an antenna with low sensitivity |
EP01903627A Expired - Lifetime EP1287585B1 (en) | 2000-05-15 | 2001-01-08 | Carrier element for an antenna with low hand sensitivity |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00110358A Withdrawn EP1158601A1 (en) | 2000-05-15 | 2000-05-15 | Support device with an antenna with low sensitivity |
Country Status (5)
Country | Link |
---|---|
US (1) | US6637665B2 (en) |
EP (2) | EP1158601A1 (en) |
AT (1) | ATE255771T1 (en) |
DE (1) | DE50101086D1 (en) |
WO (1) | WO2001089034A1 (en) |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003256789A (en) * | 2002-02-26 | 2003-09-12 | Sony Corp | Memory device and memory storage device |
JP2005033413A (en) | 2003-07-10 | 2005-02-03 | Matsushita Electric Ind Co Ltd | Loop aerial and noncontact ic card reader/writer |
JP2005176307A (en) * | 2003-11-19 | 2005-06-30 | Matsushita Electric Ind Co Ltd | Antenna element, loop antenna employing the same, and wireless communication medium processor |
EP1760828A1 (en) * | 2005-08-31 | 2007-03-07 | Incard SA | Contactless integrated circuit device |
US8201746B2 (en) * | 2006-01-24 | 2012-06-19 | Agency For Science, Technology And Research | On-chip antenna and a method of fabricating the same |
KR100836536B1 (en) * | 2006-12-21 | 2008-06-10 | 한국과학기술원 | Sip(system-in-package) having reduced effect on antenna by conductor and method for designing sip thereof |
US20130126622A1 (en) * | 2011-08-08 | 2013-05-23 | David Finn | Offsetting shielding and enhancing coupling in metallized smart cards |
WO2012033031A1 (en) | 2010-09-07 | 2012-03-15 | 株式会社村田製作所 | Antenna apparatus and communication terminal apparatus |
US9390364B2 (en) | 2011-08-08 | 2016-07-12 | Féinics Amatech Teoranta | Transponder chip module with coupling frame on a common substrate for secure and non-secure smartcards and tags |
US10867235B2 (en) | 2011-08-08 | 2020-12-15 | Féinics Amatech Teoranta | Metallized smartcard constructions and methods |
US10733494B2 (en) | 2014-08-10 | 2020-08-04 | Féinics Amatech Teoranta | Contactless metal card constructions |
US10518518B2 (en) | 2013-01-18 | 2019-12-31 | Féinics Amatech Teoranta | Smart cards with metal layer(s) and methods of manufacture |
US9475086B2 (en) | 2013-01-18 | 2016-10-25 | Féinics Amatech Teoranta | Smartcard with coupling frame and method of increasing activation distance of a transponder chip module |
US9798968B2 (en) | 2013-01-18 | 2017-10-24 | Féinics Amatech Teoranta | Smartcard with coupling frame and method of increasing activation distance of a transponder chip module |
US9812782B2 (en) | 2011-08-08 | 2017-11-07 | Féinics Amatech Teoranta | Coupling frames for RFID devices |
JP2015513712A (en) * | 2012-01-23 | 2015-05-14 | フェイニクス アマテック テオランタ | Metallized smart card shielding cancellation and increased coupling |
US10783426B2 (en) | 2012-08-30 | 2020-09-22 | David Finn | Dual-interface metal hybrid smartcard |
US10824931B2 (en) | 2012-08-30 | 2020-11-03 | Féinics Amatech Teoranta | Contactless smartcards with multiple coupling frames |
US10552722B2 (en) | 2014-08-10 | 2020-02-04 | Féinics Amatech Teoranta | Smartcard with coupling frame antenna |
US10248902B1 (en) | 2017-11-06 | 2019-04-02 | Féinics Amatech Teoranta | Coupling frames for RFID devices |
US10599972B2 (en) | 2013-01-18 | 2020-03-24 | Féinics Amatech Teoranta | Smartcard constructions and methods |
US11928537B2 (en) | 2013-01-18 | 2024-03-12 | Amatech Group Limited | Manufacturing metal inlays for dual interface metal cards |
US11354560B2 (en) | 2013-01-18 | 2022-06-07 | Amatech Group Limited | Smartcards with multiple coupling frames |
US11551051B2 (en) | 2013-01-18 | 2023-01-10 | Amatech Group Limiied | Coupling frames for smartcards with various module opening shapes |
US10977542B2 (en) | 2013-01-18 | 2021-04-13 | Amtech Group Limited Industrial Estate | Smart cards with metal layer(s) and methods of manufacture |
US11341389B2 (en) | 2013-01-18 | 2022-05-24 | Amatech Group Limited | Manufacturing metal inlays for dual interface metal cards |
US11354558B2 (en) | 2013-01-18 | 2022-06-07 | Amatech Group Limited | Contactless smartcards with coupling frames |
EP2849158B1 (en) | 2013-09-13 | 2019-02-27 | Siemens Schweiz AG | Electronic ticket with manipulation protection |
FR3030908B1 (en) * | 2014-12-18 | 2016-12-09 | Stmicroelectronics Rousset | ANTENNA FOR ELECTRONIC DEVICE |
CN105870578A (en) * | 2015-02-11 | 2016-08-17 | 三星电机株式会社 | Electronic device including multiband antenna using persistent conductive border |
KR102334607B1 (en) | 2016-06-15 | 2021-12-06 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Shielded RFID Antenna |
EP3642905B1 (en) | 2017-06-23 | 2023-03-01 | 3M Innovative Properties Company | Wireless sensing devices including stable near-field antenna |
WO2019173455A1 (en) | 2018-03-07 | 2019-09-12 | X-Card Holdings, Llc | Metal card |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5226879B2 (en) * | 1972-09-19 | 1977-07-16 | ||
US4251808A (en) * | 1979-11-15 | 1981-02-17 | Lichtblau G J | Shielded balanced loop antennas for electronic security systems |
US4373163A (en) * | 1980-07-14 | 1983-02-08 | I.D. Engineering, Inc. | Loop antenna for security systems |
US4751516A (en) * | 1985-01-10 | 1988-06-14 | Lichtblau G J | Antenna system for magnetic and resonant circuit detection |
US5248989A (en) * | 1988-02-04 | 1993-09-28 | Unisan Ltd. | Magnetic field concentrator |
US5442334A (en) * | 1992-07-20 | 1995-08-15 | Stoplift Corporation | Security system having deactivatable security tag |
US6295031B1 (en) * | 1993-12-23 | 2001-09-25 | Symbol Technologies, Inc. | Memory card assembly having an integral antenna |
EP0788069A3 (en) | 1996-02-01 | 2000-01-19 | Kaba Schliesssysteme AG | Wearable identification carrier |
JPH09307329A (en) * | 1996-05-14 | 1997-11-28 | Casio Comput Co Ltd | Antenna, its manufacture and electronic device or electric watch provided with the antenna |
TW350054B (en) * | 1996-11-29 | 1999-01-11 | Mitsubishi Materials Corp | Burglarproof label |
FR2756953B1 (en) | 1996-12-10 | 1999-12-24 | Innovatron Ind Sa | PORTABLE TELEALIMENTAL OBJECT FOR CONTACTLESS COMMUNICATION WITH A TERMINAL |
-
2000
- 2000-05-15 EP EP00110358A patent/EP1158601A1/en not_active Withdrawn
-
2001
- 2001-01-08 WO PCT/EP2001/000097 patent/WO2001089034A1/en active IP Right Grant
- 2001-01-08 EP EP01903627A patent/EP1287585B1/en not_active Expired - Lifetime
- 2001-01-08 AT AT01903627T patent/ATE255771T1/en not_active IP Right Cessation
- 2001-01-08 DE DE50101086T patent/DE50101086D1/en not_active Expired - Lifetime
-
2002
- 2002-11-13 US US10/292,764 patent/US6637665B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0189034A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50101086D1 (en) | 2004-01-15 |
ATE255771T1 (en) | 2003-12-15 |
EP1287585B1 (en) | 2003-12-03 |
EP1158601A1 (en) | 2001-11-28 |
US20030057288A1 (en) | 2003-03-27 |
US6637665B2 (en) | 2003-10-28 |
WO2001089034A1 (en) | 2001-11-22 |
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